4 * Copyright (C) 1992 Rick Sladkey
6 * nfs superblock handling functions
8 * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
14 * Split from inode.c by David Howells <dhowells@redhat.com>
16 * - superblocks are indexed on server only - all inodes, dentries, etc. associated with a
17 * particular server are held in the same superblock
18 * - NFS superblocks can have several effective roots to the dentry tree
19 * - directory type roots are spliced into the tree when a path from one root reaches the root
20 * of another (see nfs_lookup())
23 #include <linux/module.h>
24 #include <linux/init.h>
26 #include <linux/time.h>
27 #include <linux/kernel.h>
29 #include <linux/string.h>
30 #include <linux/stat.h>
31 #include <linux/errno.h>
32 #include <linux/unistd.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/stats.h>
35 #include <linux/sunrpc/metrics.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/sunrpc/xprtrdma.h>
38 #include <linux/nfs_fs.h>
39 #include <linux/nfs_mount.h>
40 #include <linux/nfs4_mount.h>
41 #include <linux/lockd/bind.h>
42 #include <linux/smp_lock.h>
43 #include <linux/seq_file.h>
44 #include <linux/mount.h>
45 #include <linux/nfs_idmap.h>
46 #include <linux/vfs.h>
47 #include <linux/inet.h>
48 #include <linux/in6.h>
50 #include <linux/nfs_xdr.h>
51 #include <linux/magic.h>
52 #include <linux/parser.h>
54 #include <asm/system.h>
55 #include <asm/uaccess.h>
59 #include "delegation.h"
63 #define NFSDBG_FACILITY NFSDBG_VFS
66 /* Mount options that take no arguments */
68 Opt_posix, Opt_noposix,
73 Opt_udp, Opt_tcp, Opt_rdma,
75 Opt_rdirplus, Opt_nordirplus,
76 Opt_sharecache, Opt_nosharecache,
78 /* Mount options that take integer arguments */
80 Opt_rsize, Opt_wsize, Opt_bsize,
81 Opt_timeo, Opt_retrans,
82 Opt_acregmin, Opt_acregmax,
83 Opt_acdirmin, Opt_acdirmax,
90 /* Mount options that take string arguments */
91 Opt_sec, Opt_proto, Opt_mountproto, Opt_mounthost,
92 Opt_addr, Opt_mountaddr, Opt_clientaddr,
94 /* Mount options that are ignored */
95 Opt_userspace, Opt_deprecated,
100 static match_table_t nfs_mount_option_tokens = {
101 { Opt_userspace, "bg" },
102 { Opt_userspace, "fg" },
103 { Opt_userspace, "retry=%s" },
105 { Opt_soft, "soft" },
106 { Opt_hard, "hard" },
107 { Opt_deprecated, "intr" },
108 { Opt_deprecated, "nointr" },
109 { Opt_posix, "posix" },
110 { Opt_noposix, "noposix" },
112 { Opt_nocto, "nocto" },
114 { Opt_noac, "noac" },
115 { Opt_lock, "lock" },
116 { Opt_nolock, "nolock" },
121 { Opt_rdma, "rdma" },
123 { Opt_noacl, "noacl" },
124 { Opt_rdirplus, "rdirplus" },
125 { Opt_nordirplus, "nordirplus" },
126 { Opt_sharecache, "sharecache" },
127 { Opt_nosharecache, "nosharecache" },
129 { Opt_port, "port=%u" },
130 { Opt_rsize, "rsize=%u" },
131 { Opt_wsize, "wsize=%u" },
132 { Opt_bsize, "bsize=%u" },
133 { Opt_timeo, "timeo=%u" },
134 { Opt_retrans, "retrans=%u" },
135 { Opt_acregmin, "acregmin=%u" },
136 { Opt_acregmax, "acregmax=%u" },
137 { Opt_acdirmin, "acdirmin=%u" },
138 { Opt_acdirmax, "acdirmax=%u" },
139 { Opt_actimeo, "actimeo=%u" },
140 { Opt_namelen, "namlen=%u" },
141 { Opt_mountport, "mountport=%u" },
142 { Opt_mountvers, "mountvers=%u" },
143 { Opt_nfsvers, "nfsvers=%u" },
144 { Opt_nfsvers, "vers=%u" },
146 { Opt_sec, "sec=%s" },
147 { Opt_proto, "proto=%s" },
148 { Opt_mountproto, "mountproto=%s" },
149 { Opt_addr, "addr=%s" },
150 { Opt_clientaddr, "clientaddr=%s" },
151 { Opt_mounthost, "mounthost=%s" },
152 { Opt_mountaddr, "mountaddr=%s" },
158 Opt_xprt_udp, Opt_xprt_tcp, Opt_xprt_rdma,
163 static match_table_t nfs_xprt_protocol_tokens = {
164 { Opt_xprt_udp, "udp" },
165 { Opt_xprt_tcp, "tcp" },
166 { Opt_xprt_rdma, "rdma" },
168 { Opt_xprt_err, NULL }
172 Opt_sec_none, Opt_sec_sys,
173 Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
174 Opt_sec_lkey, Opt_sec_lkeyi, Opt_sec_lkeyp,
175 Opt_sec_spkm, Opt_sec_spkmi, Opt_sec_spkmp,
180 static match_table_t nfs_secflavor_tokens = {
181 { Opt_sec_none, "none" },
182 { Opt_sec_none, "null" },
183 { Opt_sec_sys, "sys" },
185 { Opt_sec_krb5, "krb5" },
186 { Opt_sec_krb5i, "krb5i" },
187 { Opt_sec_krb5p, "krb5p" },
189 { Opt_sec_lkey, "lkey" },
190 { Opt_sec_lkeyi, "lkeyi" },
191 { Opt_sec_lkeyp, "lkeyp" },
193 { Opt_sec_spkm, "spkm3" },
194 { Opt_sec_spkmi, "spkm3i" },
195 { Opt_sec_spkmp, "spkm3p" },
197 { Opt_sec_err, NULL }
201 static void nfs_umount_begin(struct super_block *);
202 static int nfs_statfs(struct dentry *, struct kstatfs *);
203 static int nfs_show_options(struct seq_file *, struct vfsmount *);
204 static int nfs_show_stats(struct seq_file *, struct vfsmount *);
205 static int nfs_get_sb(struct file_system_type *, int, const char *, void *, struct vfsmount *);
206 static int nfs_xdev_get_sb(struct file_system_type *fs_type,
207 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
208 static void nfs_kill_super(struct super_block *);
209 static void nfs_put_super(struct super_block *);
210 static int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
212 static struct file_system_type nfs_fs_type = {
213 .owner = THIS_MODULE,
215 .get_sb = nfs_get_sb,
216 .kill_sb = nfs_kill_super,
217 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
220 struct file_system_type nfs_xdev_fs_type = {
221 .owner = THIS_MODULE,
223 .get_sb = nfs_xdev_get_sb,
224 .kill_sb = nfs_kill_super,
225 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
228 static const struct super_operations nfs_sops = {
229 .alloc_inode = nfs_alloc_inode,
230 .destroy_inode = nfs_destroy_inode,
231 .write_inode = nfs_write_inode,
232 .put_super = nfs_put_super,
233 .statfs = nfs_statfs,
234 .clear_inode = nfs_clear_inode,
235 .umount_begin = nfs_umount_begin,
236 .show_options = nfs_show_options,
237 .show_stats = nfs_show_stats,
238 .remount_fs = nfs_remount,
242 static int nfs4_get_sb(struct file_system_type *fs_type,
243 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
244 static int nfs4_xdev_get_sb(struct file_system_type *fs_type,
245 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
246 static int nfs4_referral_get_sb(struct file_system_type *fs_type,
247 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt);
248 static void nfs4_kill_super(struct super_block *sb);
250 static struct file_system_type nfs4_fs_type = {
251 .owner = THIS_MODULE,
253 .get_sb = nfs4_get_sb,
254 .kill_sb = nfs4_kill_super,
255 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
258 struct file_system_type nfs4_xdev_fs_type = {
259 .owner = THIS_MODULE,
261 .get_sb = nfs4_xdev_get_sb,
262 .kill_sb = nfs4_kill_super,
263 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
266 struct file_system_type nfs4_referral_fs_type = {
267 .owner = THIS_MODULE,
269 .get_sb = nfs4_referral_get_sb,
270 .kill_sb = nfs4_kill_super,
271 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
274 static const struct super_operations nfs4_sops = {
275 .alloc_inode = nfs_alloc_inode,
276 .destroy_inode = nfs_destroy_inode,
277 .write_inode = nfs_write_inode,
278 .statfs = nfs_statfs,
279 .clear_inode = nfs4_clear_inode,
280 .umount_begin = nfs_umount_begin,
281 .show_options = nfs_show_options,
282 .show_stats = nfs_show_stats,
283 .remount_fs = nfs_remount,
287 static struct shrinker acl_shrinker = {
288 .shrink = nfs_access_cache_shrinker,
289 .seeks = DEFAULT_SEEKS,
293 * Register the NFS filesystems
295 int __init register_nfs_fs(void)
299 ret = register_filesystem(&nfs_fs_type);
303 ret = nfs_register_sysctl();
307 ret = register_filesystem(&nfs4_fs_type);
311 register_shrinker(&acl_shrinker);
316 nfs_unregister_sysctl();
319 unregister_filesystem(&nfs_fs_type);
325 * Unregister the NFS filesystems
327 void __exit unregister_nfs_fs(void)
329 unregister_shrinker(&acl_shrinker);
331 unregister_filesystem(&nfs4_fs_type);
333 nfs_unregister_sysctl();
334 unregister_filesystem(&nfs_fs_type);
337 void nfs_sb_active(struct nfs_server *server)
339 atomic_inc(&server->active);
342 void nfs_sb_deactive(struct nfs_server *server)
344 if (atomic_dec_and_test(&server->active))
345 wake_up(&server->active_wq);
348 static void nfs_put_super(struct super_block *sb)
350 struct nfs_server *server = NFS_SB(sb);
352 * Make sure there are no outstanding ops to this server.
353 * If so, wait for them to finish before allowing the
354 * unmount to continue.
356 wait_event(server->active_wq, atomic_read(&server->active) == 0);
360 * Deliver file system statistics to userspace
362 static int nfs_statfs(struct dentry *dentry, struct kstatfs *buf)
364 struct nfs_server *server = NFS_SB(dentry->d_sb);
365 unsigned char blockbits;
366 unsigned long blockres;
367 struct nfs_fh *fh = NFS_FH(dentry->d_inode);
368 struct nfs_fattr fattr;
369 struct nfs_fsstat res = {
376 error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
379 buf->f_type = NFS_SUPER_MAGIC;
382 * Current versions of glibc do not correctly handle the
383 * case where f_frsize != f_bsize. Eventually we want to
384 * report the value of wtmult in this field.
386 buf->f_frsize = dentry->d_sb->s_blocksize;
389 * On most *nix systems, f_blocks, f_bfree, and f_bavail
390 * are reported in units of f_frsize. Linux hasn't had
391 * an f_frsize field in its statfs struct until recently,
392 * thus historically Linux's sys_statfs reports these
393 * fields in units of f_bsize.
395 buf->f_bsize = dentry->d_sb->s_blocksize;
396 blockbits = dentry->d_sb->s_blocksize_bits;
397 blockres = (1 << blockbits) - 1;
398 buf->f_blocks = (res.tbytes + blockres) >> blockbits;
399 buf->f_bfree = (res.fbytes + blockres) >> blockbits;
400 buf->f_bavail = (res.abytes + blockres) >> blockbits;
402 buf->f_files = res.tfiles;
403 buf->f_ffree = res.afiles;
405 buf->f_namelen = server->namelen;
411 dprintk("%s: statfs error = %d\n", __func__, -error);
417 * Map the security flavour number to a name
419 static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour)
421 static const struct {
422 rpc_authflavor_t flavour;
425 { RPC_AUTH_NULL, "null" },
426 { RPC_AUTH_UNIX, "sys" },
427 { RPC_AUTH_GSS_KRB5, "krb5" },
428 { RPC_AUTH_GSS_KRB5I, "krb5i" },
429 { RPC_AUTH_GSS_KRB5P, "krb5p" },
430 { RPC_AUTH_GSS_LKEY, "lkey" },
431 { RPC_AUTH_GSS_LKEYI, "lkeyi" },
432 { RPC_AUTH_GSS_LKEYP, "lkeyp" },
433 { RPC_AUTH_GSS_SPKM, "spkm" },
434 { RPC_AUTH_GSS_SPKMI, "spkmi" },
435 { RPC_AUTH_GSS_SPKMP, "spkmp" },
436 { UINT_MAX, "unknown" }
440 for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) {
441 if (sec_flavours[i].flavour == flavour)
444 return sec_flavours[i].str;
447 static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss,
450 struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address;
452 switch (sap->sa_family) {
454 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
455 seq_printf(m, ",mountaddr=" NIPQUAD_FMT,
456 NIPQUAD(sin->sin_addr.s_addr));
460 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
461 seq_printf(m, ",mountaddr=" NIP6_FMT,
462 NIP6(sin6->sin6_addr));
467 seq_printf(m, ",mountaddr=unspecified");
470 if (nfss->mountd_version || showdefaults)
471 seq_printf(m, ",mountvers=%u", nfss->mountd_version);
472 if (nfss->mountd_port || showdefaults)
473 seq_printf(m, ",mountport=%u", nfss->mountd_port);
475 switch (nfss->mountd_protocol) {
477 seq_printf(m, ",mountproto=udp");
480 seq_printf(m, ",mountproto=tcp");
484 seq_printf(m, ",mountproto=auto");
489 * Describe the mount options in force on this server representation
491 static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss,
494 static const struct proc_nfs_info {
499 { NFS_MOUNT_SOFT, ",soft", ",hard" },
500 { NFS_MOUNT_INTR, ",intr", ",nointr" },
501 { NFS_MOUNT_POSIX, ",posix", "" },
502 { NFS_MOUNT_NOCTO, ",nocto", "" },
503 { NFS_MOUNT_NOAC, ",noac", "" },
504 { NFS_MOUNT_NONLM, ",nolock", "" },
505 { NFS_MOUNT_NOACL, ",noacl", "" },
506 { NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" },
507 { NFS_MOUNT_UNSHARED, ",nosharecache", ""},
510 const struct proc_nfs_info *nfs_infop;
511 struct nfs_client *clp = nfss->nfs_client;
512 u32 version = clp->rpc_ops->version;
514 seq_printf(m, ",vers=%u", version);
515 seq_printf(m, ",rsize=%u", nfss->rsize);
516 seq_printf(m, ",wsize=%u", nfss->wsize);
517 if (nfss->bsize != 0)
518 seq_printf(m, ",bsize=%u", nfss->bsize);
519 seq_printf(m, ",namlen=%u", nfss->namelen);
520 if (nfss->acregmin != 3*HZ || showdefaults)
521 seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ);
522 if (nfss->acregmax != 60*HZ || showdefaults)
523 seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ);
524 if (nfss->acdirmin != 30*HZ || showdefaults)
525 seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ);
526 if (nfss->acdirmax != 60*HZ || showdefaults)
527 seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ);
528 for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
529 if (nfss->flags & nfs_infop->flag)
530 seq_puts(m, nfs_infop->str);
532 seq_puts(m, nfs_infop->nostr);
534 seq_printf(m, ",proto=%s",
535 rpc_peeraddr2str(nfss->client, RPC_DISPLAY_PROTO));
537 if (nfss->port != NFS_PORT)
538 seq_printf(m, ",port=%u", nfss->port);
541 seq_printf(m, ",port=%u", nfss->port);
543 seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ);
544 seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries);
545 seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor));
548 nfs_show_mountd_options(m, nfss, showdefaults);
551 if (clp->rpc_ops->version == 4)
552 seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr);
557 * Describe the mount options on this VFS mountpoint
559 static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
561 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
563 nfs_show_mount_options(m, nfss, 0);
565 seq_printf(m, ",addr=%s",
566 rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient,
573 * Present statistical information for this VFS mountpoint
575 static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
578 struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
579 struct rpc_auth *auth = nfss->client->cl_auth;
580 struct nfs_iostats totals = { };
582 seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);
585 * Display all mount option settings
587 seq_printf(m, "\n\topts:\t");
588 seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
589 seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
590 seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
591 seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
592 nfs_show_mount_options(m, nfss, 1);
594 seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);
596 seq_printf(m, "\n\tcaps:\t");
597 seq_printf(m, "caps=0x%x", nfss->caps);
598 seq_printf(m, ",wtmult=%u", nfss->wtmult);
599 seq_printf(m, ",dtsize=%u", nfss->dtsize);
600 seq_printf(m, ",bsize=%u", nfss->bsize);
601 seq_printf(m, ",namlen=%u", nfss->namelen);
604 if (nfss->nfs_client->rpc_ops->version == 4) {
605 seq_printf(m, "\n\tnfsv4:\t");
606 seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
607 seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
608 seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
613 * Display security flavor in effect for this mount
615 seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor);
617 seq_printf(m, ",pseudoflavor=%u", auth->au_flavor);
620 * Display superblock I/O counters
622 for_each_possible_cpu(cpu) {
623 struct nfs_iostats *stats;
626 stats = per_cpu_ptr(nfss->io_stats, cpu);
628 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
629 totals.events[i] += stats->events[i];
630 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
631 totals.bytes[i] += stats->bytes[i];
636 seq_printf(m, "\n\tevents:\t");
637 for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
638 seq_printf(m, "%lu ", totals.events[i]);
639 seq_printf(m, "\n\tbytes:\t");
640 for (i = 0; i < __NFSIOS_BYTESMAX; i++)
641 seq_printf(m, "%Lu ", totals.bytes[i]);
644 rpc_print_iostats(m, nfss->client);
650 * Begin unmount by attempting to remove all automounted mountpoints we added
651 * in response to xdev traversals and referrals
653 static void nfs_umount_begin(struct super_block *sb)
655 struct nfs_server *server = NFS_SB(sb);
656 struct rpc_clnt *rpc;
658 /* -EIO all pending I/O */
659 rpc = server->client_acl;
661 rpc_killall_tasks(rpc);
662 rpc = server->client;
664 rpc_killall_tasks(rpc);
668 * Set the port number in an address. Be agnostic about the address family.
670 static void nfs_set_port(struct sockaddr *sap, unsigned short port)
672 switch (sap->sa_family) {
674 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
675 ap->sin_port = htons(port);
679 struct sockaddr_in6 *ap = (struct sockaddr_in6 *)sap;
680 ap->sin6_port = htons(port);
687 * Sanity-check a server address provided by the mount command.
689 * Address family must be initialized, and address must not be
690 * the ANY address for that family.
692 static int nfs_verify_server_address(struct sockaddr *addr)
694 switch (addr->sa_family) {
696 struct sockaddr_in *sa = (struct sockaddr_in *)addr;
697 return sa->sin_addr.s_addr != htonl(INADDR_ANY);
700 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
701 return !ipv6_addr_any(sa);
708 static void nfs_parse_ipv4_address(char *string, size_t str_len,
709 struct sockaddr *sap, size_t *addr_len)
711 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
712 u8 *addr = (u8 *)&sin->sin_addr.s_addr;
714 if (str_len <= INET_ADDRSTRLEN) {
715 dfprintk(MOUNT, "NFS: parsing IPv4 address %*s\n",
716 (int)str_len, string);
718 sin->sin_family = AF_INET;
719 *addr_len = sizeof(*sin);
720 if (in4_pton(string, str_len, addr, '\0', NULL))
724 sap->sa_family = AF_UNSPEC;
728 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
729 static void nfs_parse_ipv6_address(char *string, size_t str_len,
730 struct sockaddr *sap, size_t *addr_len)
732 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
733 u8 *addr = (u8 *)&sin6->sin6_addr.in6_u;
735 if (str_len <= INET6_ADDRSTRLEN) {
736 dfprintk(MOUNT, "NFS: parsing IPv6 address %*s\n",
737 (int)str_len, string);
739 sin6->sin6_family = AF_INET6;
740 *addr_len = sizeof(*sin6);
741 if (in6_pton(string, str_len, addr, '\0', NULL))
745 sap->sa_family = AF_UNSPEC;
749 static void nfs_parse_ipv6_address(char *string, size_t str_len,
750 struct sockaddr *sap, size_t *addr_len)
752 sap->sa_family = AF_UNSPEC;
758 * Construct a sockaddr based on the contents of a string that contains
759 * an IP address in presentation format.
761 * If there is a problem constructing the new sockaddr, set the address
762 * family to AF_UNSPEC.
764 static void nfs_parse_ip_address(char *string, size_t str_len,
765 struct sockaddr *sap, size_t *addr_len)
767 unsigned int i, colons;
770 for (i = 0; i < str_len; i++)
771 if (string[i] == ':')
775 nfs_parse_ipv6_address(string, str_len, sap, addr_len);
777 nfs_parse_ipv4_address(string, str_len, sap, addr_len);
781 * Error-check and convert a string of mount options from user space into
784 static int nfs_parse_mount_options(char *raw,
785 struct nfs_parsed_mount_data *mnt)
787 char *p, *string, *secdata;
791 dfprintk(MOUNT, "NFS: mount options string was NULL.\n");
794 dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
796 secdata = alloc_secdata();
800 rc = security_sb_copy_data(raw, secdata);
802 goto out_security_failure;
804 rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
806 goto out_security_failure;
808 free_secdata(secdata);
810 while ((p = strsep(&raw, ",")) != NULL) {
811 substring_t args[MAX_OPT_ARGS];
817 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", p);
819 token = match_token(p, nfs_mount_option_tokens, args);
822 mnt->flags |= NFS_MOUNT_SOFT;
825 mnt->flags &= ~NFS_MOUNT_SOFT;
828 mnt->flags |= NFS_MOUNT_POSIX;
831 mnt->flags &= ~NFS_MOUNT_POSIX;
834 mnt->flags &= ~NFS_MOUNT_NOCTO;
837 mnt->flags |= NFS_MOUNT_NOCTO;
840 mnt->flags &= ~NFS_MOUNT_NOAC;
843 mnt->flags |= NFS_MOUNT_NOAC;
846 mnt->flags &= ~NFS_MOUNT_NONLM;
849 mnt->flags |= NFS_MOUNT_NONLM;
852 mnt->flags &= ~NFS_MOUNT_VER3;
855 mnt->flags |= NFS_MOUNT_VER3;
858 mnt->flags &= ~NFS_MOUNT_TCP;
859 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
864 mnt->flags |= NFS_MOUNT_TCP;
865 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
870 mnt->flags |= NFS_MOUNT_TCP; /* for side protocols */
871 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
876 mnt->flags &= ~NFS_MOUNT_NOACL;
879 mnt->flags |= NFS_MOUNT_NOACL;
882 mnt->flags &= ~NFS_MOUNT_NORDIRPLUS;
885 mnt->flags |= NFS_MOUNT_NORDIRPLUS;
888 mnt->flags &= ~NFS_MOUNT_UNSHARED;
890 case Opt_nosharecache:
891 mnt->flags |= NFS_MOUNT_UNSHARED;
895 if (match_int(args, &option))
897 if (option < 0 || option > 65535)
899 mnt->nfs_server.port = option;
902 if (match_int(args, &mnt->rsize))
906 if (match_int(args, &mnt->wsize))
910 if (match_int(args, &option))
917 if (match_int(args, &mnt->timeo))
921 if (match_int(args, &mnt->retrans))
925 if (match_int(args, &mnt->acregmin))
929 if (match_int(args, &mnt->acregmax))
933 if (match_int(args, &mnt->acdirmin))
937 if (match_int(args, &mnt->acdirmax))
941 if (match_int(args, &option))
948 mnt->acdirmax = option;
951 if (match_int(args, &mnt->namlen))
955 if (match_int(args, &option))
957 if (option < 0 || option > 65535)
959 mnt->mount_server.port = option;
962 if (match_int(args, &option))
966 mnt->mount_server.version = option;
969 if (match_int(args, &option))
973 mnt->flags &= ~NFS_MOUNT_VER3;
976 mnt->flags |= NFS_MOUNT_VER3;
984 string = match_strdup(args);
987 token = match_token(string, nfs_secflavor_tokens, args);
991 * The flags setting is for v2/v3. The flavor_len
992 * setting is for v4. v2/v3 also need to know the
993 * difference between NULL and UNIX.
997 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
998 mnt->auth_flavor_len = 0;
999 mnt->auth_flavors[0] = RPC_AUTH_NULL;
1002 mnt->flags &= ~NFS_MOUNT_SECFLAVOUR;
1003 mnt->auth_flavor_len = 0;
1004 mnt->auth_flavors[0] = RPC_AUTH_UNIX;
1007 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1008 mnt->auth_flavor_len = 1;
1009 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5;
1012 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1013 mnt->auth_flavor_len = 1;
1014 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5I;
1017 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1018 mnt->auth_flavor_len = 1;
1019 mnt->auth_flavors[0] = RPC_AUTH_GSS_KRB5P;
1022 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1023 mnt->auth_flavor_len = 1;
1024 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEY;
1027 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1028 mnt->auth_flavor_len = 1;
1029 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYI;
1032 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1033 mnt->auth_flavor_len = 1;
1034 mnt->auth_flavors[0] = RPC_AUTH_GSS_LKEYP;
1037 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1038 mnt->auth_flavor_len = 1;
1039 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKM;
1042 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1043 mnt->auth_flavor_len = 1;
1044 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMI;
1047 mnt->flags |= NFS_MOUNT_SECFLAVOUR;
1048 mnt->auth_flavor_len = 1;
1049 mnt->auth_flavors[0] = RPC_AUTH_GSS_SPKMP;
1056 string = match_strdup(args);
1059 token = match_token(string,
1060 nfs_xprt_protocol_tokens, args);
1065 mnt->flags &= ~NFS_MOUNT_TCP;
1066 mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1071 mnt->flags |= NFS_MOUNT_TCP;
1072 mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1077 /* vector side protocols to TCP */
1078 mnt->flags |= NFS_MOUNT_TCP;
1079 mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
1084 goto out_unrec_xprt;
1087 case Opt_mountproto:
1088 string = match_strdup(args);
1091 token = match_token(string,
1092 nfs_xprt_protocol_tokens, args);
1097 mnt->mount_server.protocol = XPRT_TRANSPORT_UDP;
1100 mnt->mount_server.protocol = XPRT_TRANSPORT_TCP;
1102 case Opt_xprt_rdma: /* not used for side protocols */
1104 goto out_unrec_xprt;
1108 string = match_strdup(args);
1111 nfs_parse_ip_address(string, strlen(string),
1113 &mnt->nfs_server.address,
1114 &mnt->nfs_server.addrlen);
1117 case Opt_clientaddr:
1118 string = match_strdup(args);
1121 kfree(mnt->client_address);
1122 mnt->client_address = string;
1125 string = match_strdup(args);
1128 kfree(mnt->mount_server.hostname);
1129 mnt->mount_server.hostname = string;
1132 string = match_strdup(args);
1135 nfs_parse_ip_address(string, strlen(string),
1137 &mnt->mount_server.address,
1138 &mnt->mount_server.addrlen);
1143 case Opt_deprecated:
1144 dfprintk(MOUNT, "NFS: ignoring mount option "
1153 nfs_set_port((struct sockaddr *)&mnt->nfs_server.address,
1154 mnt->nfs_server.port);
1159 printk(KERN_INFO "NFS: not enough memory to parse option\n");
1161 out_security_failure:
1162 free_secdata(secdata);
1163 printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
1166 printk(KERN_INFO "NFS: unrecognized NFS version number\n");
1170 printk(KERN_INFO "NFS: unrecognized transport protocol\n");
1174 printk(KERN_INFO "NFS: unrecognized security flavor\n");
1178 printk(KERN_INFO "NFS: unknown mount option: %s\n", p);
1183 * Use the remote server's MOUNT service to request the NFS file handle
1184 * corresponding to the provided path.
1186 static int nfs_try_mount(struct nfs_parsed_mount_data *args,
1187 struct nfs_fh *root_fh)
1189 struct sockaddr *sap = (struct sockaddr *)&args->mount_server.address;
1193 if (args->mount_server.version == 0) {
1194 if (args->flags & NFS_MOUNT_VER3)
1195 args->mount_server.version = NFS_MNT3_VERSION;
1197 args->mount_server.version = NFS_MNT_VERSION;
1200 if (args->mount_server.hostname)
1201 hostname = args->mount_server.hostname;
1203 hostname = args->nfs_server.hostname;
1206 * Construct the mount server's address.
1208 if (args->mount_server.address.ss_family == AF_UNSPEC) {
1209 memcpy(sap, &args->nfs_server.address,
1210 args->nfs_server.addrlen);
1211 args->mount_server.addrlen = args->nfs_server.addrlen;
1215 * autobind will be used if mount_server.port == 0
1217 nfs_set_port(sap, args->mount_server.port);
1220 * Now ask the mount server to map our export path
1223 status = nfs_mount(sap,
1224 args->mount_server.addrlen,
1226 args->nfs_server.export_path,
1227 args->mount_server.version,
1228 args->mount_server.protocol,
1233 dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n",
1238 static int nfs_parse_simple_hostname(const char *dev_name,
1239 char **hostname, size_t maxnamlen,
1240 char **export_path, size_t maxpathlen)
1243 char *colon, *comma;
1245 colon = strchr(dev_name, ':');
1247 goto out_bad_devname;
1249 len = colon - dev_name;
1250 if (len > maxnamlen)
1253 /* N.B. caller will free nfs_server.hostname in all cases */
1254 *hostname = kstrndup(dev_name, len, GFP_KERNEL);
1258 /* kill possible hostname list: not supported */
1259 comma = strchr(*hostname, ',');
1260 if (comma != NULL) {
1261 if (comma == *hostname)
1262 goto out_bad_devname;
1267 len = strlen(colon);
1268 if (len > maxpathlen)
1270 *export_path = kstrndup(colon, len, GFP_KERNEL);
1274 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
1278 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1282 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1286 dfprintk(MOUNT, "NFS: server hostname too long\n");
1287 return -ENAMETOOLONG;
1290 dfprintk(MOUNT, "NFS: export pathname too long\n");
1291 return -ENAMETOOLONG;
1295 * Hostname has square brackets around it because it contains one or
1296 * more colons. We look for the first closing square bracket, and a
1297 * colon must follow it.
1299 static int nfs_parse_protected_hostname(const char *dev_name,
1300 char **hostname, size_t maxnamlen,
1301 char **export_path, size_t maxpathlen)
1306 start = (char *)(dev_name + 1);
1308 end = strchr(start, ']');
1310 goto out_bad_devname;
1311 if (*(end + 1) != ':')
1312 goto out_bad_devname;
1315 if (len > maxnamlen)
1318 /* N.B. caller will free nfs_server.hostname in all cases */
1319 *hostname = kstrndup(start, len, GFP_KERNEL);
1320 if (*hostname == NULL)
1325 if (len > maxpathlen)
1327 *export_path = kstrndup(end, len, GFP_KERNEL);
1334 dfprintk(MOUNT, "NFS: device name not in host:path format\n");
1338 dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
1342 dfprintk(MOUNT, "NFS: server hostname too long\n");
1343 return -ENAMETOOLONG;
1346 dfprintk(MOUNT, "NFS: export pathname too long\n");
1347 return -ENAMETOOLONG;
1351 * Split "dev_name" into "hostname:export_path".
1353 * The leftmost colon demarks the split between the server's hostname
1354 * and the export path. If the hostname starts with a left square
1355 * bracket, then it may contain colons.
1357 * Note: caller frees hostname and export path, even on error.
1359 static int nfs_parse_devname(const char *dev_name,
1360 char **hostname, size_t maxnamlen,
1361 char **export_path, size_t maxpathlen)
1363 if (*dev_name == '[')
1364 return nfs_parse_protected_hostname(dev_name,
1365 hostname, maxnamlen,
1366 export_path, maxpathlen);
1368 return nfs_parse_simple_hostname(dev_name,
1369 hostname, maxnamlen,
1370 export_path, maxpathlen);
1374 * Validate the NFS2/NFS3 mount data
1375 * - fills in the mount root filehandle
1377 * For option strings, user space handles the following behaviors:
1379 * + DNS: mapping server host name to IP address ("addr=" option)
1381 * + failure mode: how to behave if a mount request can't be handled
1382 * immediately ("fg/bg" option)
1384 * + retry: how often to retry a mount request ("retry=" option)
1386 * + breaking back: trying proto=udp after proto=tcp, v2 after v3,
1387 * mountproto=tcp after mountproto=udp, and so on
1389 static int nfs_validate_mount_data(void *options,
1390 struct nfs_parsed_mount_data *args,
1391 struct nfs_fh *mntfh,
1392 const char *dev_name)
1394 struct nfs_mount_data *data = (struct nfs_mount_data *)options;
1399 args->flags = (NFS_MOUNT_VER3 | NFS_MOUNT_TCP);
1400 args->rsize = NFS_MAX_FILE_IO_SIZE;
1401 args->wsize = NFS_MAX_FILE_IO_SIZE;
1405 args->acregmax = 60;
1406 args->acdirmin = 30;
1407 args->acdirmax = 60;
1408 args->mount_server.port = 0; /* autobind unless user sets port */
1409 args->mount_server.protocol = XPRT_TRANSPORT_UDP;
1410 args->nfs_server.port = 0; /* autobind unless user sets port */
1411 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
1413 switch (data->version) {
1419 if (data->flags & NFS_MOUNT_VER3)
1421 data->root.size = NFS2_FHSIZE;
1422 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
1424 if (data->flags & NFS_MOUNT_SECFLAVOUR)
1427 memset(data->context, 0, sizeof(data->context));
1429 if (data->flags & NFS_MOUNT_VER3) {
1430 if (data->root.size > NFS3_FHSIZE || data->root.size == 0)
1431 goto out_invalid_fh;
1432 mntfh->size = data->root.size;
1434 mntfh->size = NFS2_FHSIZE;
1437 memcpy(mntfh->data, data->root.data, mntfh->size);
1438 if (mntfh->size < sizeof(mntfh->data))
1439 memset(mntfh->data + mntfh->size, 0,
1440 sizeof(mntfh->data) - mntfh->size);
1443 * Translate to nfs_parsed_mount_data, which nfs_fill_super
1446 args->flags = data->flags;
1447 args->rsize = data->rsize;
1448 args->wsize = data->wsize;
1449 args->timeo = data->timeo;
1450 args->retrans = data->retrans;
1451 args->acregmin = data->acregmin;
1452 args->acregmax = data->acregmax;
1453 args->acdirmin = data->acdirmin;
1454 args->acdirmax = data->acdirmax;
1456 memcpy(&args->nfs_server.address, &data->addr,
1457 sizeof(data->addr));
1458 args->nfs_server.addrlen = sizeof(data->addr);
1459 if (!nfs_verify_server_address((struct sockaddr *)
1460 &args->nfs_server.address))
1461 goto out_no_address;
1463 if (!(data->flags & NFS_MOUNT_TCP))
1464 args->nfs_server.protocol = XPRT_TRANSPORT_UDP;
1465 /* N.B. caller will free nfs_server.hostname in all cases */
1466 args->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL);
1467 args->namlen = data->namlen;
1468 args->bsize = data->bsize;
1469 args->auth_flavors[0] = data->pseudoflavor;
1470 if (!args->nfs_server.hostname)
1474 * The legacy version 6 binary mount data from userspace has a
1475 * field used only to transport selinux information into the
1476 * the kernel. To continue to support that functionality we
1477 * have a touch of selinux knowledge here in the NFS code. The
1478 * userspace code converted context=blah to just blah so we are
1479 * converting back to the full string selinux understands.
1481 if (data->context[0]){
1482 #ifdef CONFIG_SECURITY_SELINUX
1484 char *opts_str = kmalloc(sizeof(data->context) + 8, GFP_KERNEL);
1487 strcpy(opts_str, "context=");
1488 data->context[NFS_MAX_CONTEXT_LEN] = '\0';
1489 strcat(opts_str, &data->context[0]);
1490 rc = security_sb_parse_opts_str(opts_str, &args->lsm_opts);
1503 if (nfs_parse_mount_options((char *)options, args) == 0)
1506 if (!nfs_verify_server_address((struct sockaddr *)
1507 &args->nfs_server.address))
1508 goto out_no_address;
1510 status = nfs_parse_devname(dev_name,
1511 &args->nfs_server.hostname,
1513 &args->nfs_server.export_path,
1516 status = nfs_try_mount(args, mntfh);
1518 kfree(args->nfs_server.export_path);
1519 args->nfs_server.export_path = NULL;
1528 if (!(args->flags & NFS_MOUNT_SECFLAVOUR))
1529 args->auth_flavors[0] = RPC_AUTH_UNIX;
1531 #ifndef CONFIG_NFS_V3
1532 if (args->flags & NFS_MOUNT_VER3)
1533 goto out_v3_not_compiled;
1534 #endif /* !CONFIG_NFS_V3 */
1539 dfprintk(MOUNT, "NFS: mount program didn't pass any mount data\n");
1543 dfprintk(MOUNT, "NFS: nfs_mount_data version %d does not support v3\n",
1548 dfprintk(MOUNT, "NFS: nfs_mount_data version supports only AUTH_SYS\n");
1551 #ifndef CONFIG_NFS_V3
1552 out_v3_not_compiled:
1553 dfprintk(MOUNT, "NFS: NFSv3 is not compiled into kernel\n");
1554 return -EPROTONOSUPPORT;
1555 #endif /* !CONFIG_NFS_V3 */
1558 dfprintk(MOUNT, "NFS: not enough memory to handle mount options\n");
1562 dfprintk(MOUNT, "NFS: mount program didn't pass remote address\n");
1566 dfprintk(MOUNT, "NFS: invalid root filehandle\n");
1571 nfs_compare_remount_data(struct nfs_server *nfss,
1572 struct nfs_parsed_mount_data *data)
1574 if (data->flags != nfss->flags ||
1575 data->rsize != nfss->rsize ||
1576 data->wsize != nfss->wsize ||
1577 data->retrans != nfss->client->cl_timeout->to_retries ||
1578 data->auth_flavors[0] != nfss->client->cl_auth->au_flavor ||
1579 data->acregmin != nfss->acregmin / HZ ||
1580 data->acregmax != nfss->acregmax / HZ ||
1581 data->acdirmin != nfss->acdirmin / HZ ||
1582 data->acdirmax != nfss->acdirmax / HZ ||
1583 data->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) ||
1584 data->nfs_server.addrlen != nfss->nfs_client->cl_addrlen ||
1585 memcmp(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1586 data->nfs_server.addrlen) != 0)
1593 nfs_remount(struct super_block *sb, int *flags, char *raw_data)
1596 struct nfs_server *nfss = sb->s_fs_info;
1597 struct nfs_parsed_mount_data *data;
1598 struct nfs_mount_data *options = (struct nfs_mount_data *)raw_data;
1599 struct nfs4_mount_data *options4 = (struct nfs4_mount_data *)raw_data;
1600 u32 nfsvers = nfss->nfs_client->rpc_ops->version;
1603 * Userspace mount programs that send binary options generally send
1604 * them populated with default values. We have no way to know which
1605 * ones were explicitly specified. Fall back to legacy behavior and
1606 * just return success.
1608 if ((nfsvers == 4 && options4->version == 1) ||
1609 (nfsvers <= 3 && options->version >= 1 &&
1610 options->version <= 6))
1613 data = kzalloc(sizeof(*data), GFP_KERNEL);
1617 /* fill out struct with values from existing mount */
1618 data->flags = nfss->flags;
1619 data->rsize = nfss->rsize;
1620 data->wsize = nfss->wsize;
1621 data->retrans = nfss->client->cl_timeout->to_retries;
1622 data->auth_flavors[0] = nfss->client->cl_auth->au_flavor;
1623 data->acregmin = nfss->acregmin / HZ;
1624 data->acregmax = nfss->acregmax / HZ;
1625 data->acdirmin = nfss->acdirmin / HZ;
1626 data->acdirmax = nfss->acdirmax / HZ;
1627 data->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ;
1628 data->nfs_server.addrlen = nfss->nfs_client->cl_addrlen;
1629 memcpy(&data->nfs_server.address, &nfss->nfs_client->cl_addr,
1630 data->nfs_server.addrlen);
1632 /* overwrite those values with any that were specified */
1633 error = nfs_parse_mount_options((char *)options, data);
1637 /* compare new mount options with old ones */
1638 error = nfs_compare_remount_data(nfss, data);
1645 * Initialise the common bits of the superblock
1647 static inline void nfs_initialise_sb(struct super_block *sb)
1649 struct nfs_server *server = NFS_SB(sb);
1651 sb->s_magic = NFS_SUPER_MAGIC;
1653 /* We probably want something more informative here */
1654 snprintf(sb->s_id, sizeof(sb->s_id),
1655 "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));
1657 if (sb->s_blocksize == 0)
1658 sb->s_blocksize = nfs_block_bits(server->wsize,
1659 &sb->s_blocksize_bits);
1661 if (server->flags & NFS_MOUNT_NOAC)
1662 sb->s_flags |= MS_SYNCHRONOUS;
1664 nfs_super_set_maxbytes(sb, server->maxfilesize);
1668 * Finish setting up an NFS2/3 superblock
1670 static void nfs_fill_super(struct super_block *sb,
1671 struct nfs_parsed_mount_data *data)
1673 struct nfs_server *server = NFS_SB(sb);
1675 sb->s_blocksize_bits = 0;
1676 sb->s_blocksize = 0;
1678 sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
1680 if (server->flags & NFS_MOUNT_VER3) {
1681 /* The VFS shouldn't apply the umask to mode bits. We will do
1682 * so ourselves when necessary.
1684 sb->s_flags |= MS_POSIXACL;
1685 sb->s_time_gran = 1;
1688 sb->s_op = &nfs_sops;
1689 nfs_initialise_sb(sb);
1693 * Finish setting up a cloned NFS2/3 superblock
1695 static void nfs_clone_super(struct super_block *sb,
1696 const struct super_block *old_sb)
1698 struct nfs_server *server = NFS_SB(sb);
1700 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
1701 sb->s_blocksize = old_sb->s_blocksize;
1702 sb->s_maxbytes = old_sb->s_maxbytes;
1704 if (server->flags & NFS_MOUNT_VER3) {
1705 /* The VFS shouldn't apply the umask to mode bits. We will do
1706 * so ourselves when necessary.
1708 sb->s_flags |= MS_POSIXACL;
1709 sb->s_time_gran = 1;
1712 sb->s_op = old_sb->s_op;
1713 nfs_initialise_sb(sb);
1716 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
1718 static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, int flags)
1720 const struct nfs_server *a = s->s_fs_info;
1721 const struct rpc_clnt *clnt_a = a->client;
1722 const struct rpc_clnt *clnt_b = b->client;
1724 if ((s->s_flags & NFS_MS_MASK) != (flags & NFS_MS_MASK))
1726 if (a->nfs_client != b->nfs_client)
1728 if (a->flags != b->flags)
1730 if (a->wsize != b->wsize)
1732 if (a->rsize != b->rsize)
1734 if (a->acregmin != b->acregmin)
1736 if (a->acregmax != b->acregmax)
1738 if (a->acdirmin != b->acdirmin)
1740 if (a->acdirmax != b->acdirmax)
1742 if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor)
1749 struct nfs_sb_mountdata {
1750 struct nfs_server *server;
1754 static int nfs_set_super(struct super_block *s, void *data)
1756 struct nfs_sb_mountdata *sb_mntdata = data;
1757 struct nfs_server *server = sb_mntdata->server;
1760 s->s_flags = sb_mntdata->mntflags;
1761 s->s_fs_info = server;
1762 ret = set_anon_super(s, server);
1764 server->s_dev = s->s_dev;
1768 static int nfs_compare_super_address(struct nfs_server *server1,
1769 struct nfs_server *server2)
1771 struct sockaddr *sap1, *sap2;
1773 sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
1774 sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
1776 if (sap1->sa_family != sap2->sa_family)
1779 switch (sap1->sa_family) {
1781 struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1;
1782 struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2;
1783 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr)
1785 if (sin1->sin_port != sin2->sin_port)
1790 struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1;
1791 struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2;
1792 if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr))
1794 if (sin1->sin6_port != sin2->sin6_port)
1805 static int nfs_compare_super(struct super_block *sb, void *data)
1807 struct nfs_sb_mountdata *sb_mntdata = data;
1808 struct nfs_server *server = sb_mntdata->server, *old = NFS_SB(sb);
1809 int mntflags = sb_mntdata->mntflags;
1811 if (!nfs_compare_super_address(old, server))
1813 /* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */
1814 if (old->flags & NFS_MOUNT_UNSHARED)
1816 if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0)
1818 return nfs_compare_mount_options(sb, server, mntflags);
1821 static int nfs_bdi_register(struct nfs_server *server)
1823 return bdi_register_dev(&server->backing_dev_info, server->s_dev);
1826 static int nfs_get_sb(struct file_system_type *fs_type,
1827 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
1829 struct nfs_server *server = NULL;
1830 struct super_block *s;
1831 struct nfs_parsed_mount_data *data;
1832 struct nfs_fh *mntfh;
1833 struct dentry *mntroot;
1834 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1835 struct nfs_sb_mountdata sb_mntdata = {
1838 int error = -ENOMEM;
1840 data = kzalloc(sizeof(*data), GFP_KERNEL);
1841 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
1842 if (data == NULL || mntfh == NULL)
1845 security_init_mnt_opts(&data->lsm_opts);
1847 /* Validate the mount data */
1848 error = nfs_validate_mount_data(raw_data, data, mntfh, dev_name);
1852 /* Get a volume representation */
1853 server = nfs_create_server(data, mntfh);
1854 if (IS_ERR(server)) {
1855 error = PTR_ERR(server);
1858 sb_mntdata.server = server;
1860 if (server->flags & NFS_MOUNT_UNSHARED)
1861 compare_super = NULL;
1863 /* Get a superblock - note that we may end up sharing one that already exists */
1864 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
1870 if (s->s_fs_info != server) {
1871 nfs_free_server(server);
1874 error = nfs_bdi_register(server);
1876 goto error_splat_super;
1880 /* initial superblock/root creation */
1881 nfs_fill_super(s, data);
1884 mntroot = nfs_get_root(s, mntfh);
1885 if (IS_ERR(mntroot)) {
1886 error = PTR_ERR(mntroot);
1887 goto error_splat_super;
1890 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
1892 goto error_splat_root;
1894 s->s_flags |= MS_ACTIVE;
1896 mnt->mnt_root = mntroot;
1900 kfree(data->nfs_server.hostname);
1901 kfree(data->mount_server.hostname);
1902 security_free_mnt_opts(&data->lsm_opts);
1909 nfs_free_server(server);
1915 up_write(&s->s_umount);
1916 deactivate_super(s);
1921 * Destroy an NFS2/3 superblock
1923 static void nfs_kill_super(struct super_block *s)
1925 struct nfs_server *server = NFS_SB(s);
1927 bdi_unregister(&server->backing_dev_info);
1929 nfs_free_server(server);
1933 * Clone an NFS2/3 server record on xdev traversal (FSID-change)
1935 static int nfs_xdev_get_sb(struct file_system_type *fs_type, int flags,
1936 const char *dev_name, void *raw_data,
1937 struct vfsmount *mnt)
1939 struct nfs_clone_mount *data = raw_data;
1940 struct super_block *s;
1941 struct nfs_server *server;
1942 struct dentry *mntroot;
1943 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
1944 struct nfs_sb_mountdata sb_mntdata = {
1949 dprintk("--> nfs_xdev_get_sb()\n");
1951 /* create a new volume representation */
1952 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
1953 if (IS_ERR(server)) {
1954 error = PTR_ERR(server);
1955 goto out_err_noserver;
1957 sb_mntdata.server = server;
1959 if (server->flags & NFS_MOUNT_UNSHARED)
1960 compare_super = NULL;
1962 /* Get a superblock - note that we may end up sharing one that already exists */
1963 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
1969 if (s->s_fs_info != server) {
1970 nfs_free_server(server);
1973 error = nfs_bdi_register(server);
1975 goto error_splat_super;
1979 /* initial superblock/root creation */
1980 nfs_clone_super(s, data->sb);
1983 mntroot = nfs_get_root(s, data->fh);
1984 if (IS_ERR(mntroot)) {
1985 error = PTR_ERR(mntroot);
1986 goto error_splat_super;
1988 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
1991 goto error_splat_super;
1994 s->s_flags |= MS_ACTIVE;
1996 mnt->mnt_root = mntroot;
1998 /* clone any lsm security options from the parent to the new sb */
1999 security_sb_clone_mnt_opts(data->sb, s);
2001 dprintk("<-- nfs_xdev_get_sb() = 0\n");
2005 nfs_free_server(server);
2007 dprintk("<-- nfs_xdev_get_sb() = %d [error]\n", error);
2011 up_write(&s->s_umount);
2012 deactivate_super(s);
2013 dprintk("<-- nfs_xdev_get_sb() = %d [splat]\n", error);
2017 #ifdef CONFIG_NFS_V4
2020 * Finish setting up a cloned NFS4 superblock
2022 static void nfs4_clone_super(struct super_block *sb,
2023 const struct super_block *old_sb)
2025 sb->s_blocksize_bits = old_sb->s_blocksize_bits;
2026 sb->s_blocksize = old_sb->s_blocksize;
2027 sb->s_maxbytes = old_sb->s_maxbytes;
2028 sb->s_time_gran = 1;
2029 sb->s_op = old_sb->s_op;
2030 nfs_initialise_sb(sb);
2034 * Set up an NFS4 superblock
2036 static void nfs4_fill_super(struct super_block *sb)
2038 sb->s_time_gran = 1;
2039 sb->s_op = &nfs4_sops;
2040 nfs_initialise_sb(sb);
2044 * Validate NFSv4 mount options
2046 static int nfs4_validate_mount_data(void *options,
2047 struct nfs_parsed_mount_data *args,
2048 const char *dev_name)
2050 struct sockaddr_in *ap;
2051 struct nfs4_mount_data *data = (struct nfs4_mount_data *)options;
2057 args->rsize = NFS_MAX_FILE_IO_SIZE;
2058 args->wsize = NFS_MAX_FILE_IO_SIZE;
2062 args->acregmax = 60;
2063 args->acdirmin = 30;
2064 args->acdirmax = 60;
2065 args->nfs_server.port = NFS_PORT; /* 2049 unless user set port= */
2066 args->nfs_server.protocol = XPRT_TRANSPORT_TCP;
2068 switch (data->version) {
2070 ap = (struct sockaddr_in *)&args->nfs_server.address;
2071 if (data->host_addrlen > sizeof(args->nfs_server.address))
2072 goto out_no_address;
2073 if (data->host_addrlen == 0)
2074 goto out_no_address;
2075 args->nfs_server.addrlen = data->host_addrlen;
2076 if (copy_from_user(ap, data->host_addr, data->host_addrlen))
2078 if (!nfs_verify_server_address((struct sockaddr *)
2079 &args->nfs_server.address))
2080 goto out_no_address;
2082 switch (data->auth_flavourlen) {
2084 args->auth_flavors[0] = RPC_AUTH_UNIX;
2087 if (copy_from_user(&args->auth_flavors[0],
2088 data->auth_flavours,
2089 sizeof(args->auth_flavors[0])))
2093 goto out_inval_auth;
2096 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN);
2099 args->nfs_server.hostname = c;
2101 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN);
2104 args->nfs_server.export_path = c;
2105 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c);
2107 c = strndup_user(data->client_addr.data, 16);
2110 args->client_address = c;
2113 * Translate to nfs_parsed_mount_data, which nfs4_fill_super
2117 args->flags = data->flags & NFS4_MOUNT_FLAGMASK;
2118 args->rsize = data->rsize;
2119 args->wsize = data->wsize;
2120 args->timeo = data->timeo;
2121 args->retrans = data->retrans;
2122 args->acregmin = data->acregmin;
2123 args->acregmax = data->acregmax;
2124 args->acdirmin = data->acdirmin;
2125 args->acdirmax = data->acdirmax;
2126 args->nfs_server.protocol = data->proto;
2132 if (nfs_parse_mount_options((char *)options, args) == 0)
2135 if (!nfs_verify_server_address((struct sockaddr *)
2136 &args->nfs_server.address))
2139 switch (args->auth_flavor_len) {
2141 args->auth_flavors[0] = RPC_AUTH_UNIX;
2146 goto out_inval_auth;
2149 if (args->client_address == NULL)
2150 goto out_no_client_address;
2152 status = nfs_parse_devname(dev_name,
2153 &args->nfs_server.hostname,
2155 &args->nfs_server.export_path,
2167 dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n");
2171 dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n",
2172 data->auth_flavourlen);
2176 dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
2179 out_no_client_address:
2180 dfprintk(MOUNT, "NFS4: mount program didn't pass callback address\n");
2185 * Get the superblock for an NFS4 mountpoint
2187 static int nfs4_get_sb(struct file_system_type *fs_type,
2188 int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
2190 struct nfs_parsed_mount_data *data;
2191 struct super_block *s;
2192 struct nfs_server *server;
2193 struct nfs_fh *mntfh;
2194 struct dentry *mntroot;
2195 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2196 struct nfs_sb_mountdata sb_mntdata = {
2199 int error = -ENOMEM;
2201 data = kzalloc(sizeof(*data), GFP_KERNEL);
2202 mntfh = kzalloc(sizeof(*mntfh), GFP_KERNEL);
2203 if (data == NULL || mntfh == NULL)
2206 security_init_mnt_opts(&data->lsm_opts);
2208 /* Validate the mount data */
2209 error = nfs4_validate_mount_data(raw_data, data, dev_name);
2213 /* Get a volume representation */
2214 server = nfs4_create_server(data, mntfh);
2215 if (IS_ERR(server)) {
2216 error = PTR_ERR(server);
2219 sb_mntdata.server = server;
2221 if (server->flags & NFS4_MOUNT_UNSHARED)
2222 compare_super = NULL;
2224 /* Get a superblock - note that we may end up sharing one that already exists */
2225 s = sget(fs_type, compare_super, nfs_set_super, &sb_mntdata);
2231 if (s->s_fs_info != server) {
2232 nfs_free_server(server);
2235 error = nfs_bdi_register(server);
2237 goto error_splat_super;
2241 /* initial superblock/root creation */
2245 mntroot = nfs4_get_root(s, mntfh);
2246 if (IS_ERR(mntroot)) {
2247 error = PTR_ERR(mntroot);
2248 goto error_splat_super;
2251 error = security_sb_set_mnt_opts(s, &data->lsm_opts);
2253 goto error_splat_root;
2255 s->s_flags |= MS_ACTIVE;
2257 mnt->mnt_root = mntroot;
2261 kfree(data->client_address);
2262 kfree(data->nfs_server.export_path);
2263 kfree(data->nfs_server.hostname);
2264 security_free_mnt_opts(&data->lsm_opts);
2271 nfs_free_server(server);
2277 up_write(&s->s_umount);
2278 deactivate_super(s);
2282 static void nfs4_kill_super(struct super_block *sb)
2284 struct nfs_server *server = NFS_SB(sb);
2286 nfs_return_all_delegations(sb);
2287 kill_anon_super(sb);
2289 nfs4_renewd_prepare_shutdown(server);
2290 nfs_free_server(server);
2294 * Clone an NFS4 server record on xdev traversal (FSID-change)
2296 static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
2297 const char *dev_name, void *raw_data,
2298 struct vfsmount *mnt)
2300 struct nfs_clone_mount *data = raw_data;
2301 struct super_block *s;
2302 struct nfs_server *server;
2303 struct dentry *mntroot;
2304 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2305 struct nfs_sb_mountdata sb_mntdata = {
2310 dprintk("--> nfs4_xdev_get_sb()\n");
2312 /* create a new volume representation */
2313 server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr);
2314 if (IS_ERR(server)) {
2315 error = PTR_ERR(server);
2316 goto out_err_noserver;
2318 sb_mntdata.server = server;
2320 if (server->flags & NFS4_MOUNT_UNSHARED)
2321 compare_super = NULL;
2323 /* Get a superblock - note that we may end up sharing one that already exists */
2324 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2330 if (s->s_fs_info != server) {
2331 nfs_free_server(server);
2334 error = nfs_bdi_register(server);
2336 goto error_splat_super;
2340 /* initial superblock/root creation */
2341 nfs4_clone_super(s, data->sb);
2344 mntroot = nfs4_get_root(s, data->fh);
2345 if (IS_ERR(mntroot)) {
2346 error = PTR_ERR(mntroot);
2347 goto error_splat_super;
2349 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2352 goto error_splat_super;
2355 s->s_flags |= MS_ACTIVE;
2357 mnt->mnt_root = mntroot;
2359 security_sb_clone_mnt_opts(data->sb, s);
2361 dprintk("<-- nfs4_xdev_get_sb() = 0\n");
2365 nfs_free_server(server);
2367 dprintk("<-- nfs4_xdev_get_sb() = %d [error]\n", error);
2371 up_write(&s->s_umount);
2372 deactivate_super(s);
2373 dprintk("<-- nfs4_xdev_get_sb() = %d [splat]\n", error);
2378 * Create an NFS4 server record on referral traversal
2380 static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
2381 const char *dev_name, void *raw_data,
2382 struct vfsmount *mnt)
2384 struct nfs_clone_mount *data = raw_data;
2385 struct super_block *s;
2386 struct nfs_server *server;
2387 struct dentry *mntroot;
2388 struct nfs_fh mntfh;
2389 int (*compare_super)(struct super_block *, void *) = nfs_compare_super;
2390 struct nfs_sb_mountdata sb_mntdata = {
2395 dprintk("--> nfs4_referral_get_sb()\n");
2397 /* create a new volume representation */
2398 server = nfs4_create_referral_server(data, &mntfh);
2399 if (IS_ERR(server)) {
2400 error = PTR_ERR(server);
2401 goto out_err_noserver;
2403 sb_mntdata.server = server;
2405 if (server->flags & NFS4_MOUNT_UNSHARED)
2406 compare_super = NULL;
2408 /* Get a superblock - note that we may end up sharing one that already exists */
2409 s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
2415 if (s->s_fs_info != server) {
2416 nfs_free_server(server);
2419 error = nfs_bdi_register(server);
2421 goto error_splat_super;
2425 /* initial superblock/root creation */
2429 mntroot = nfs4_get_root(s, &mntfh);
2430 if (IS_ERR(mntroot)) {
2431 error = PTR_ERR(mntroot);
2432 goto error_splat_super;
2434 if (mntroot->d_inode->i_op != NFS_SB(s)->nfs_client->rpc_ops->dir_inode_ops) {
2437 goto error_splat_super;
2440 s->s_flags |= MS_ACTIVE;
2442 mnt->mnt_root = mntroot;
2444 security_sb_clone_mnt_opts(data->sb, s);
2446 dprintk("<-- nfs4_referral_get_sb() = 0\n");
2450 nfs_free_server(server);
2452 dprintk("<-- nfs4_referral_get_sb() = %d [error]\n", error);
2456 up_write(&s->s_umount);
2457 deactivate_super(s);
2458 dprintk("<-- nfs4_referral_get_sb() = %d [splat]\n", error);
2462 #endif /* CONFIG_NFS_V4 */